I can't send messages to others on teams, all shown failure

Superco Liam 20 Reputation points
2025-09-02T01:45:08.5566667+00:00

I've been looking for one of my clients, so I kept sending the same inquiry messages  to people who are under the same name. However, i found i am unable to send messages. All messages i sent are shown failure. I tried to turn to ******@mail.support.microsoft.com for help, but i didn't get any reply which is upsetting.

 

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Kimberly Olaño 23,610 Reputation points
2025-09-02T02:58:50.1766667+00:00

Hi! Superco. Thanks for the details and for bringing this up, I'm here to help.

The “message failed to send” issue in Microsoft Teams can happen for a few different reasons, and the fact that all of your messages fail points to either an account, license, or network/policy issue.

Here are the possible fixes to the issue:

  1. Check if you can message teammates in your own org
    • If you can chat internally but not with external people, this is a policy/permission issue.
    • If you cannot chat with anyone at all, it’s likely account/license or suspension.
  2. Sign out and clear Teams cache
    • Quit Teams.
    • Delete the cache folder:
    • Windows: C:\Users<YourName>\AppData\Roaming\Microsoft\Teams
    • Mac: ~/Library/Application Support/Microsoft/Teams
    • Restart Teams and sign back in.
  3. Test Teams on another device / web version
  4. Check with your IT admin (if using work/school account)
    • Ask if external messaging is allowed.
    • Verify your license is valid (e.g., Microsoft 365 Business Standard, E3, etc.).
  5. If using Teams Free (personal)
    • External business accounts often won’t accept messages from personal/free Teams accounts.
    • In that case, you’d need the recipient’s org to enable “External Access.”
  6. If you think you’ve been blocked for spam-like behavior
    • Stop sending repeated identical messages.
    • Wait a few hours or a day, temporary restrictions sometimes lift automatically.

See if this helps. If you need further assistance, just let me know.

Best regards,

Kimberly

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  1. Kimberly Olaño 23,610 Reputation points
    2025-09-02T03:17:36.07+00:00

    Yes, restrictions often lift automatically, but only if you stop sending messages that look spammy.

    What you can do now:

    Stop trying to send repeated messages for now — every new attempt may extend the restriction timer.

    Wait at least 48–72 hours and test again.

    Check if restrictions lift by trying to start a new chat with someone you know will respond.

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